Apparatus for treating impure molten metals



A ril 27 1926 1,582,038

' H. HARRIS APPARATUS FOR TREATING IMPURE MOLTEN METALS Fileti April. 26. 1 4 4 Sheets-Sheet l jvwawfoz M MM 5% WWW "4 April 27 1926. 1,582,038

H. HARRIS APPARATUS FOR TREATING IMPURE MOLTEN METALS Filed A riize. 1924 4 Sheets-Sheet 2 Fig.4.

I l I] April 27, 1926. 1,582,038

. H. HARRIS v APPARATUS FOR TREATING IMPURE MOLTEN METALS Filed April 26, 1924 4 Sheets-Sheet 5 Fig.5.

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Apnl 27 1926. 1,582,038

H. HARRIS APPARATUS FOR TREATING IMPURE MOLTBN METALS Filed pril 264 1924 4 sheets sheet 4 luvcnfoz Patented Apr. 27, 1926.

UNITED, STATES PATENT. OFFICE-hi.

nnunrnannrs, or LONDON, mensun.

' resident of London, England, have invented certain new and useful Improvements in Apparatus for Treating Impure Molten llletals, of which the folowing is a specification. J

This invention relates to improvementsin treating molten metals (and by the term metals 1 include alloys) and' more particularly to apparatus for treating ignpure molten metals with a reagent. l l

The method hereinafter described and carried out by the apparatus. forms the (subject matter of my co-pending applicamolten lead.

herewith. i

In certain known processes for the tion Serial No. 709,088 filed on even date treatment of impure molten metals to, elnnirrate one or more of the impurities. or alloying elements, the molten metalllc mass is treated with a molten reagent or reagents which act upon or absorb or otherwise become associated with the contained impurities such as copper, zinc, tin, arsenic, antimony, bismuth and the like. As illustinting a prior process of the character in question refercncc'may be made to the specification of my co-pendi'ng application Serial No. 568,632, filed June 15, 1922, wherein as one example a molten mixture of caustic soda and sodium chloride with a suitable oxidizing reagent such as .nitrate of soda is used as the reagent for treating in carrying; out such processes it is very reagents from the resulting mixture or mass containing the reagent and impurit es. To accomplish this recovery the mixture must be dissolved or brought into a state of solu-' tion. as with Water and the solution of the reagent or reagent mlxture, as the case may be, must be separated from the impurities,

after which in order to get the reagent into form forfurther use as a molt-en reagent,

' the solution must be evaporated to substantial dryness and then fused. I This evuportion is costly due to the expensive apparatus required and the large amount of space occupied by the same, the cost of conducting the operation and the -AP2ARATU$ FOR TREATING IMPUBE MOLTEN METALS-u Application filed April 26, 1924. Serial No. 709,089.

time required. Also the use of a molten reagent requires apparatus for heating same.

Among the objects of the present invention are, to obviate these expenses and oh jections inherent in the use of a molten 60 reagent; to otherwise simplify and render more efiicient the treatment of the molten metallic mass, and to render possible the efficient use of certain reagents which here-- tofore could not be used efficiently in the as form of a molten reagent.

My invention consists in the novel Il TG-El' tures of construction, arrangement and combinations of parts, and adaptations of apparatus hereinafter described, by way of example, according to certain specific cmbodiment-s thereof. The invention will be more particularly pointed out in the appended claims. v

In order that the objects of the invention and the desired functions of the apparatus will be more readily understood, 1 will first describe the process.

My process generally stated comprises the use of a solution of a reagent or of a mixture of reagents for the treatment of the molten metallic mass. The molten metal and reagent are brought into intimate contact one with another. The heated molten metal may itself be utilized to evaporate the water 8 of the solution either directly by bringing the two materials into direct contact, or

' indirectly as by causingthe molten metallic mass to heat a vessel into which the solution is passed, and preferably into which the molten metal is admitted. Alternatively such vessel may be heated otherwise as for example by the heating medium used to keep the metallic mass molten. In any case the evaporated water in the form of steam or apart of it may be utilized to bring about in suitable manner intimate Contact or intermingling of the reagent and molten metal. The spent reagent carrying the impurity or impurities from the metallic mass may .then be recovered in molten, semi-molten or solid form as the case maybe. This reagent mixed with impurity may then be brought into solution in known manner and the reagent separated therefrom in the form of a solution and again used for another retining operation without being dried or fused.

The process thus not only eliminates the cost and delay incidental to the usual evaporating procedure but it also makes it possible to utilize the heated molten metallic mass to evaporate the Water ironi'the reagent solution .and utilize the generated steam in the process. It also permits the use of a reagent which is soluble but not readily fusible at temperatures at Which metals can be eliiciently relined or separated.

I will describe by Way ofillustration some examples of how the method may be carried out.

I use in solution form a reagent mixture comprising caustic soda, sodium chloride and a suitable oxidizing agent'such as nitrate of soda, which I have heretofore used in molten form. This solution is then brought into intimate contact with the molten metallic mass to be refinedysay im-.

pure molten lead, by having the molten lead kept at a temperature which may be less than 500 C. and forcibly injecting the solution into the lead relying upon the generated steam to force the reagent particles through the mass of thelead, with or Without additional stirring. ()r as above statedthe solution may be fed under pressure into a vessel into which the molten metal is also admitted, and the pressure oi steam, generatedby evaporation of the solution, utilized to force the molten metal and dehydrated reagent out through a pipe in which they will be intimately intermingled. If desired the pipe may lead to a reagent pot sealed at its lower end by the metal, in which case the metal may be repeatedly passed through the vaporizer and reagent pot; as hereinafter described.

It will be understood that so far as coucerns the process, any suitable form ot'apparatus may be utilized to eli'ect the de ired mixing of the soluble reagent and n1 hen metal having due regard to the fact ;.that the molten metal is of much greater specilic gravity than the reagent solution.

In the particular example just given any other suitable reagent may be used in solution such for example as the others mentioned in the specification of my said copending United States application Serial No. 568,632.

, As further examples of the reagent mixture used by me I may mention for instance-in the decoppering of lead as one example, the use or a solution of alkali sulphide or of sulphur dissolved in caustic alkali. As another example I may use for the dezincmg of lead a solution of zinc chloride and sodium chloride with or Without a suitable oxidizing agent deliberately added to assist the natural oxidizing action of the air to which access is given.

- While I have given concrete examples as 'to-the treatment of molten lead by the use of reagents-in solution, i do not wish smaller amount of anaddcd oxidizer tojthe reagent may be used because of the oxidizing influence of the steam in certain cases. Since it at times adds greatly to the elii ciency of refining some metals to be able to conduct the operations at temperatures at which some reagents do not fuse, it will be seen that this process permits the use of such reagents in the treatment of metallic masses at the desired low temperature.

The invention will be more readily understood by reference to the following description of certain embodiments of the invention, shown in the drawings by way of example.

Apparatus.

, Referring to the drawings, Figure l is a diagrammatic sectional elevation of a pot containing a molten metallic mass into which a reagent solution delivery pipe extends;

Figures 2 and 3 are diagrammatic sectional elevations'of two. further arrangements in which provision is made for controlling and utilizing the steam evolved from the reagent solution.

Figure 4. is a somewhat diagrammatic sectional elevation of a complete apparatus operative in accordance with the present invention, Figure 5 being a similar view with certain parts raised and Figure 6 being a plan view illustrating in particular the power transmission mechanism for the moving parts.

In Figure 1 of the accompanying drawings the reagent solution is delivered into direct contact with the molten metallic mass in the potl through the open-ended pipe 2 having its free end immersed to a suitable depth below the level of the molten metallic mass. The steam generated by the contact of the reagent solution with the molten nietallic mass spreads throughout the latter in rising therethrough and serves to inter mingle the reagent with the metal so that an efficient refining o f the latter takes place. Instead of a plain or open-ended pipe I may of course provide a rose or other form of distributor at the mouth of the pipe.

In the modified form of apparatus shown in Figure 2 the heat of the molten metallic mass is utilized for vaporizing purposes indirectly by causing it to heat a vaporizing element which in turn parts with its heat to the reagent solution. in the construction ime vessel or chamber 3 in the molten metallic mass in the pot l and l. forcethe reagent solution preferably in sprayed lorin into it througli'the pipe The steam liberated by contact of the solution against the hot walls of the vessel 3 or against a splash plate 3 or thelike therein, creates internal pressure which can be regulated by outlet pipes at and valves 5 and 'tllLlS utilized. to force the reagent in dehydrated form out of the vessel and into contact with the molten metallic mass.

The reagent may be forced out through a. hole or outletvalve 6 in the vessel 3 be neath the. top of the molten metalhc'mass in which case the reagent with or without entrained steam will be dispersed, upwardly through the molten mass, and the particles.

of the dehydrated reagent will be caused to intimately" inter-mingle with the molten metal throughout the mass of the same, to bring about the desired reactions in the metal for the purification or other change in the condition of the same. Alternatively shown in. Figure 3 the vesselinay have no outlet below the .uiolten-mass, so that the steam under pressure in. the vessel must force the reagent up an. exit pipe 7 ext-ending to a more, convenient spot for the reaction, as for example into a reaction chamber 8 in which the molten metallic mayabe cir culatecl through the reagent collected in it by suitable means. If desired the vessel 3 although having no subi'nerged outlet may have a submerged inlet or inletlvalve 9 so that the molten metallic mass will periodically Well up into the interior of the vessel and be carried over with the reagent according to the generul principle of operation of the Well know ltoesiug pump, thereby obviating the necessity of using separate pump or the liketo circulate the molten metallic mass through the reagent or at least supplementing the cllect of such pump. As is Well understood by those chilled in the art, such a pump operates on the principle of admitting fluid into the compression chamber until the level of the fluid in the chamber rises above a certain outlet passage whereupon pressure in the chamber, which may be brought about by admission of compressed air or the like, closes the valve in the inlet portend forces the fluid out of the chamber through the outlet orifice until the level of the fluid recedes below the outlet orifice Whereupon the pressure of the impelling air or other medium in the char her isreduced and the inlet valve again opens to admit more of the fluid to be pumped until the fluid again rises whereupon the pressure again causes it to be discharged through the outlet orifice, and so on,

-Instead of leaving the steam pressure to relieve itself periodically by passing up the,

to the level of the outlet orifice,.

exit pipe 7, a rotary ported valve or slide valve or the like (hereinafter described) on the steam outlet pipe l or elsewhere u'luy be provided to permit periodic escape ct thesteain so that the molten metal will pert ii.

heating purposes or a part of it may be con ducted through a pipe 10 (Fig. 3) to be utilized as a get to agitate or cause circulation in pot l, of the molten metallic mass to keep its temperature uniform. .lt to be understood, however, that I do not confine myself to. this particular method of agitating the molten metallic mass which uiay for example be and preferably is agitated. mechanically, as hereinafter describ In the complete apparatus as in Figures', 5 and 6, I utilize the steam ge rated in the vaporizing vessel 3 by the heated molten metallic mass, to force the molten metal and thereagent {which due to the heat may now behr a fused form} up the exit pipe into an open-ended cylinder ll surmount g a p i2 provided with an automaticinlet valve 13 or other suitable valve at its base and a trap or metal seal 14. which prevents the escape of reagent (which may only partially be spent.) from cylinder it into. pot 1, and allows the metallic mass (which. may only partially be refined) to pass back freed from reagent, which re mains in the cylinder, into the pot l ln. this way the metallic mass is brought into very. intimate contact with the trapped re--. agent which is sealed at its lower end by the molten metal, and may be repeatedly the reagent from time to time and introducting fresh batches of the reagent solution,

or solutions ofdifi'erent reagents and if necessary by altering the physical condition somewhat as by a change of temperature.

In this Way the most easily separated iurpurity can be removed first substantially uucontaminated with. other impurities, which latter can be similarly separated in succession,

In the constructional arr ngeuieut oil apparatus shown in Figures 4, 5 and 6, the.

vaporizing vessel or flash boiler 3 and the reagent cylinder 11 constitute the main elements of a single unit movable from place to place by overhead means such as the crane 15. This unit also comprises ahorizontal irame 16 integral with a vertical frame 17 and is firmly held in position on the 'pot 1 by holding down screw hooks 18. The molten metallic massto be refined is contained in the pot 1 set in a furnace substantially,as described in my United States Patent No. 1,465,128, granted August 11, 1923.

The vaporizing vessel 8 is shown provided at its base with two inlet ball or other suitable valves 9 designed to allow of the entry only of metal and with jets 19 set in a jet ring 20 or other suitable distributing device for conducting or spraying the reagent solution onto the walls of the vaporizer The reagent is delivered to this ring byany suitable connection. To assist in the spraying either compressed air or steam may be used. The mixture of metal and reagent forced through the pipe T is delivered into the reagent cylinder 11 by a distributor 21 which may be designed to split up the mixture into thin streams or line drops.

The valve 1;; in the base of the metal seal pot 12 enables the molten metallic mass to pass into the pot when the apparatus is lowered into the molten metal bathgand is adapted to be closed when lifted out of the metal. The valve is mounted on an arm or lever pivoted at 123 and this lever is provided on the opposite side of the pivot from the valve mem her, with a weight 13 shown in the form of a ball. When the pot is being immersed in the molten metal the bouyant force of the molten metal on the. ball weight will counteract the force 01 gravity on the ball and cause,

the arm to swing upward on its pivot to open the valve and allow metal to llow from the pot 1 into the metal seal pot 12 until it reaches the level of the metal in the pot 1. 1V hen it is desired to lift the pot 12 from the pot 1, as the pot is being lifted'the valve will again elosodue to the presence of metal in metal seal pot 12, in time to prevent any molten reagent that may be in the cylinder 11 from passing out through the valve into the pot 1.

During a refining operation further quantities of metal are dcliveredinto pot 12 from the vessel 3, but it overflows through the port 22 of the metal seal or trap 11. The overflowing molten metab passes back unmixed with reagent into the pot 1 leaving the reagent, which is of less density, in the eyl inder 11 where it floats on the surface of the metal trapped in pot 12.

' I may provide theport 22 of the pot 12 with a metal seal screw valve 22 provided with a handle 22, operated from any convenient position outside the apparatus, so

that, when I desire to remove the reagent contained in the cylinder ll'instead of removing the cylinder 11 and its pot 12 bodily from the apparatus, for which provision is made, and then pouring out the reagent, 1 may partially or entirely close this screw valve, thus preventing a portion or the whole of the metal from flowing out of the outlet port 22 into thepot 1, with the result that continues to the level of the metal, whic flow into the cylinder 11, will rise, forcing the molten reagent (which owing to its lower specific gravity floats on the surface of the metal) to overl'low from the cylinder 11 over a suitable spout 11 (Fig. 6) into a portable receptacle.

Operating in the cylinder 11 and pot 12 are stirrer arms 23 fixed to a stirrer shaft 21 driven through a gear box 25 by a motor 26 (Fig. 6). This motor further drives througlr' shaft 27 stirrers 28 which serve to stir the molten metal in the bath 1 so as continually to present fresh and hotter molten metal to the external surface otthe vaporizer b. This motor also drives a rotating piston valve 25) which serves, when it is open, to allow of the escape througha separator ot' the steam generated by. evaporation of the reagent solution in the vaporizer :3. The separator 30 is designed to re turn to the vaporizer any reagent solution entrained with the steam.

The valve 29 has a variable opening which can be regulated during operation and is automatically rotated, its speed of rotating being regulated by a radially shit'table triction disc drive 31. v p 7 Some parts oi the apparatuswhich are above the metal bath may be enclosed in a casing 222 which serves, when necessary, to heat the separator 30 and the cylinder 11 by means of the waste furnace gases. For, by opening the damper 33 and closing the damper 34, the furnace gases are conducted from the flue 35 up the inlet flue pipe 36 01 the apparatus round the interior of the casing 1-52 and are drawn through the outlet flue pipe 37, in the direction of the; arrow shown in Fig. 4.

Should I not desire thus to heat the apparatus, I may close the inlet line damper 33 and open the damper-.3 1, when the gases will pass directly from the flue 35 into the main fine as shown by arrdws in Fig. 5.

Operation.

3 until it reaches the level of the metal in the pot land. at the" same time the metallic mass alsorises into the metal seal pot 12 until it attained the same level. The unit is then. secured by the holding down screw hooks 18. The motor 26 is then set in motion and the stirrers' 23 and 28 are rotated. A. solution of a suitable reagent is then introduced through the jets 19 or is otherwise suitably sprayed into the vaporizer 3 under a' pressure which may be greater than that of the internal pressure intended. to be generated in the vaporizer. The solution is evaporated due to contact with the walls of the vaporizer heated by the molten metallic mass. in the pot a, the

reagent is partially or wholly dehydrated, and steam is generated.

It the valve 29 be-kept full open, the metal and dehydrated reagent remain in the vaporizer, and steam leaves the'apparatu's by way-of the outlet port of the valve. I

It the valve 29 be kept closed, the pressure of steam generated in the vaporizer forces the molten metallic mass with dehydrated reagent up exit pipe 7 until the liquid level in the vaporizerreaches just below that of the bottom end of thesaid pipe 7 through which the steam can then escape relieving the pressure within the vaporizer and allow ing the molten metallic mass "to again rise through the'inlet valve 9 thereby preventing i for the time further escape of steam and causing another increase of pressure within the vaporizer, whereupon the molten metal with dehydrated reagent and steam is again forced up the exit pipe. Thus with valve 29 remaining closed, the intermittcnt'pumpingin rapid pulsations ofmetal fromithe pot, through valve 9 and up the exit pipe .7 together with dehydrated reagent and steam into the cylinder 11 continues so long as the generation of steam in the vaporizer is maintained. i I In most instances however in the refining of metals it is necessary to be able to limit or even prevent the escape of steam mixed with the "stream of metal and reagent issuing from the delivery pipe. This object is attained by revolving the piston valve 29 so asto permit of the escape through it of any desired proportion of the steam gener-/ ated in the vaporizer for prearranged inter m ttent periods of time.

I I I Through adjust ment of the action of this valve :29, which ad ustment can be effected while the valve .is in rotation, the variation of the level of the dehydrated reagent amlmetal in the vaporizer, which depends upon variations of the internal pressure of steam, can be controlled so that if necessary the level never falls toa point at whiclrsteam can leave the vaporizer through'the exit pipe 7 the end of which can be kept continuously sealed by metal and dehydrated reagent, metal entering the vaporizer through the valve 9 at its base when the piston valve 29 is open and the metal and reagent being GjOCtQtl only when the valve 29 is closed, any excess preslittle above the level of the pipe opening, T so that some metal and reagent will be continuously forced out together, but even it this is not exactly maintained, the fluctuations in the level can he so controlled that the reagent and metal are respectively forced into the pipe at such rapidly recurring short intervals that they are more thoroughly mixed in passing through the pipe than would be the case without such a valve.

The dehydrated reagent in being forced. I

up the exit pipe 7, is brought. into very intimate contact with the moltenmetallio mass which it accompanies, and in some the metal may be found to have been completely refined when it-issues mixed with the reagent throughthe distributor 21.

If necessary or desirable a nonmetm'n valve may be provided in the exit pipe '3 near its lower end to support the column of liquid therein. I I I In passing into the cylinder 11 owing to its considerably superlor specific 'ravlty the molten metallic mass is separated from the reagent, which remains floating on. the top of the molten metal in the metal seal pct 12 through which the metal passes, rises through the Syphon trap 14; and emerges from the outlet port .22 returning to pot 1. The pot 12 itself remains full of metal, at least to the level of the outlet port 22 and forms an efficient seal for the supernatant reagent.

When the cylinder 11 hemmes full of re agent, it may be emptied by means hereinbQfQre described and the contents treated forthe recovery or. the-reagent solution for further-refining operations and for the im-' purities which have been absorbed from the metal" being refined or separated from its alloying elements.

In certain cases I may arrange during the course of the operation to feed automati cally. into the cylinder 11 additional suln stances in a dry molten or gaseous state.

. \Vhile I have described my invention ac cording to certain particular embodiments -thereof, it will be obvious to those skilled in the art, after understanding the invention,

Oil

cover all changes andmodifications as may come within the scope of the invention.

In the specification and appended claims I use the terms molten metal and impurities for brevity and succinetness, but in a broad sense. I wish to be understood by the. term molten metal as including molten alloys or other molt-en metallic masses, and by the term impurities I wish to be understood as including-any substance or element which it is desired to remove from a metal. alloy or molten mass to bring it to a desired state or condition.

What I claim as new and desire to secure by Letters Patent, is:

1. In apparatus for the treatment of molten metal, the combination of a heated container for the molten metal, a vaporizing chamber so located in the container as to be immersed in the molten metal so as to be hcated thereby, and means for supplying a solution of a reagent to said vaporizing chamber.

In apparatus for treating molten metal, the combination of a heated container for molten metal, a vaporizing chamber so locatcd in the container as to be innnersed in the molten metal so as to be heated thereby,

and means for supplying a solution of a re'-.

agent to said vaporizing chamber in such manner that the vaporizing chamber acts as a llash boiler for the reagent, said vaporizing chamber having an opening below the level otthe molten metal in the heated container.

In apparatus for treating molten metal, the combination of a vaporizing chamber adapted to be immersed in molten metal so as to be heated thereby. means for supplying a solution of a reagent to said vaporizing chamber. and means for conveying ott' steam from the vaporizing chamber.

4. In apparatus for treating molten metal. the combination of a vaporizing chamber adapted to be immersed in molten metal so as to be heated thereby. means for supplying a solution of a reagent to said vaporiz ing chamber. and valve-controlled means for aporizing chamber. 1

5. ln apparatus for treating molten metal. the combination of a vaporizing chamber having an inlet opening for a. solution of a reagent'and having at its lower end an inlet check valve for admitting the molten metal. an outlet passage from said chamber for the discharge of molten metal and reagent. and means for controlling the pressure of gencrated steam in the chamber.

6. ln apparatus tor treating molten metal. the combination of a 'anorizing chamber having an inlet opening for a. solution ot a reagent and having at its lower end an inlet check valve, tor admitting the molten metal. an outlet passage from said chamber for the and means communicating with the conveying ofi generated steam from the" discharge of molten metal and rcagcnl. and an exhaust pipe with means for controlling pressure of generated steam in said chamber to regulate the admission of molten metal to the chamber and the discharge of molten metal and reagent therefrom.

7. In apparatus for treating molten mctal. the combination of a, vaporizing chamber having an inlet opening for a solution of? a reagent and having at its lower end an inlet. check valve for admitting the molten metal. an outlet passage extending down into the intermediate portion of said chamber for carrying otl' moltcn metal and reagent. and means for controlling the pressure of the generated steam in the vaporizing chamber.

R. In apparatus tor treating molten metal. the combination of a vaporizing -cbambcr having an inlet opening for a solution ot a reagent and having at its lower cud an inlet check valve for admitting the molten metal. an outlet passage from said chamber for the discharge of molten metal and reagent. and a valve in communication with said chamber and actuated to intermittently increase and decrease the pressure in said chamber to control the inlet of molten metal to the chamber alternate] v with the di charge of molten metal and reagent therefrom. at rapidly rccurring intervals.

9. In apparatus for treat ng molten mctal. the combination of a va mrizing chamber adapted to be immersed in moltcu mctal. an inlet check valve at the lower cud ot the chamber to admit molten metal. means tor supplying a solution of a' reagent to the chamber. a reagent container sealed at its lower cud with some of the molten metal.

vaporizing chamber tor conveying of? molten metal and reagent. from the chamber. under the impclling pressure of steam generated therein. and discharging the metal and reagent. into the reagent container.

10. In apparatus for trcating molten mctalthe con'ibination of a vaporizing chamber. means for heating the same. means for the admission of molten metal to the chamber. means tor supplying a solution of a reagent to the chamber to be vaporized by the heat. a reagentcontainer having its lower cud sealed by some of the molten metal and adapted to contain accumulated molten reagent on top of said metal. a pipe having an opening in the vaporizing chamber and communicating with said reagent. container and adapted to convey mo-ltcn mctal and reagent from the vaporizing chamber and di charge the same into the molten reagent in the container. a valve conunnnicating with the vaporizing chamber and means for actuating the same so as to intermittently increase and decrease the prcssurcin the vaporizing chamber to cause the discharge of molten metal and reagent ill marines oer,

lfi. in. apparatus for treating molten :nctni, the combination of :1 hosted container for molten metal, it vaporizing'chnn'iber mioptccl to he iunncrsorlin the molten metal I of the container,- en inlet/check vzilventthe lower end of the chamber to zidmit molten" metal from the heated container,-menns for supplying :1 solution of. in reagent to the reagent container having its;

"hen-valve mechsnisnnreegent container and chamber, e lower cud sealed by some of the molten in iron reagent on top of said metshe pipe having an inletopening at the intermediate portion. of the vaporizing chamber and communicating with said reagent containernncl adopted to convey molten metal and reagent from the vaporizing chamber and discharge the some into the reagent container, a valve metal and adapted to contain a'ccuinulatci connnunicating with the vaporizing chembcr end means for actuating the same so as to intcrn'iittently increase and-decrease the prcssurcin the vaporizing chamber to cause the discharge oi molten metal and reagent through Sllld pipe to the reagent container, "it'llflfr'illjy the metal may be circulated through said clunnbcr, pipe and reagent container.

ii. In apparatus for treating molten n'ietel, the combination of a removable frame znhiptec i to be set over a heated container for molten metal, a vaporizer chemher with an inlet opening at its lower end lfor eclmission of molten metal from the container when the chamber is lowered th-creinto, means for supplying a fluid to the chamber to effect pressure therein for discharge of the molten metal therefrom, 2:. container for molten reagent adopted to at its lower end with some of the j molten metal, means for conveying the molten metal. from the vaporizer chamber sncl discharging some into the reagent container, and. means securing said. vaporizer chamber and reagent container to the frame so that they are moved as a unit with the- ;trrnnc, and so positioning them on the :trcznc thnt they will have their lower ends properly immersed in the molten metal when the frame is set iii-position over the home i container,

epperntus for treating molten metal, the combination of n rcmovnblcframe adapted to be set over a heated coutniner for molten metal, a, vaporizing chamher having" on inlet check valve at the lower cnrl thereof to nclmit molten metal from the container when the chamber isimmerscd in the molten metal, means for supplying a, solution or o reagent to the chamber, acontainer for molten reagent adapted to be reeled in; its lower end withv some of the,

molten metal apipe having an inlet opening to the vaporizing chamber and coinmunicating with said reagent container and adapted to convey molten metal uncl reagent from the vaporizing chslnbe curl discharge the some into the reagent container, a valve communicating with the vuporizaing clnnuher, means for actuating the valve so as to intermittently increese and '(lecrcuse the pressure in the vsporizing clnunber to cause the discharge of molten metal and reagent through said. pipe to the reagent container, and, means securing said vaporizing channtainer on the frame that they will have their: lower ends properly iimnersed in the molten metal when the treine is set 111 position over the heeterl container.

14. In apparatus for treating molten motel, the flOll'llJlllLtlOll or? s heated. contanner for molten metal, at vaporizing cln1mber so located in the container ns to be immersocl in the molten metal so as to be heated tllereb r and havinr an inlet 0 ening for o solution-of a reagent and having at its lowerencl an inlet check valve for admitting the molten metal, and an outlet passage from scicl chamber for cliseherge of molten metal and reagent impelleci from thechember by the steam generated therein due to evaporation of the reagent solution.

15. In npperetus for treating molten metal, the combination of a pot for the molten metal, n container for molten rcagent lighter than the molten metal, means for discharging'molten metal into the container, said con-seiner having a discharge opening -comrnuniceting vith its lower end. and seelecl. by some of themolten ,mctal, and a valve controllingthe discharge opehing' to regulate the flow of molten' mctal metal, the combination of a pot for the molten metal, a container for molten rcngent lighter than the molten metal, a. vaporizing chamber having an inlet opcning for a solution of swirl reagent and having at its lower end an inlet check valve for admitting the molten metal, an outlet passage fromsnicl chmuher for the discharge of molten'metnl and reagent into said rc agent container, Si-hl container having :1 discharge opening communicnting with its lower cud and sealed by some of the molten metal, and valve controlling the discharge opening to regulate the flow of molten metal from the container whereby when the valve the container, said container having a discharge opening communicating with its lower end for discharging molten metal from the container into the pot, and having a valve closing its lower end and adapted to be automatically opened when the bot tom of the container is being immersed in the molten metal to permit some of the molten metal to flow into the container.

In testimony whereof I have signed my name to this specification.

HENRY MAR ltlb. 

